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/////////////////////////////////
//////**DOMINIK___KOWALCZYK**////
/////////////////////////////////

#include <bits/stdc++.h>

using namespace std;

#define boost ios_base::sync_with_stdio(0);
#define all(a) (a).begin(),(a).end()
#define sz(a) (int)(a).size()
#define ELO exit(0)


int main()
{
	boost;

	int n;
	cin >> n;
	int jed = 0;

	for (int i = 0; i < n; ++i)
	{
		int a;
		cin >> a;
		if(a == 1)jed++;
	}

	cout << max(0,2 - jed) << "\n";
	cout << "2\n";
	cout << "1 2\n";

	ELO;
}